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Rooney has scored only two league goals all season but Pardew believes that may be down to the service he is getting.
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“He is at the top of the pitch now and maybe he is not getting the service he would probably want,” he told reporters.
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“I can see a little bit of frustration in him but that makes him dangerous. Rooney has proved many times, particularly when he gets criticism, that he can deliver.
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“We’ll be on our guard for Wayne. He’s an outstanding player, he’s the England captain and we’ll give him the respect he deserves.”
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After an impressive start to the season, Palace have lost their last three games, including a 5-1 defeat by Manchester City in the Capital One (League) Cup on Wednesday.
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They now face United and Liverpool on successive weekends.
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“This little run is a real test,” Pardew said.
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“But I still think if a bit of fortune had gone our way we could have picked up points.”
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He said that United’s visit would be “a great occasion”, adding that it was “about time” Palace beat them.
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United have lost only one of the last 19 meetings between the teams, a League Cup tie in 2011.
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